<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Xml
 * @copyright  Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Exception.php 2794 2007-01-16 01:29:51Z bkarwin $
 * @author     John Coggeshall <john@zend.com>
 */

/**
 * Zend_InfoCard_Xml_EncryptedData/Abstract.php
 */
require_once 'Zend/InfoCard/Xml/EncryptedData/Abstract.php';

/**
 * An XmlEnc formatted EncryptedData XML block
 * 
 * @category   Zend
 * @package    Zend_InfoCard
 * @subpackage Zend_InfoCard_Xml
 * @copyright  Copyright (c) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @author     John Coggeshall <john@zend.com>
 */
class Zend_InfoCard_Xml_EncryptedData_XmlEnc extends Zend_InfoCard_Xml_EncryptedData_Abstract 
{

	/**
	 * Returns the Encrypted CipherValue block from the EncryptedData XML document
	 *
	 * @throws Zend_InfoCard_Xml_Exception
	 * @return string The value of the CipherValue block base64 encoded
	 */
    public function getCipherValue() 
    {
		$this->registerXPathNamespace('enc', 'http://www.w3.org/2001/04/xmlenc#');
			
		list(,$cipherdata) = $this->xpath("//enc:CipherData");
		
		if(!($cipherdata instanceof Zend_InfoCard_Xml_Element)) {
			throw new Zend_InfoCard_Xml_Exception("Unable to find the enc:CipherData block");
		}
		
		list(,$ciphervalue) = $cipherdata->xpath("//enc:CipherValue");
		
		if(!($ciphervalue instanceof Zend_InfoCard_Xml_Element)) {
			throw new Zend_InfoCard_Xml_Exception("Unable to fidn the enc:CipherValue block");
		}
		
		return (string)$ciphervalue;		
	}
}
